The square root of 40 is 6.32455532 (rounded to 8 decimal places).
The square root of 40 is 6.32455532 (rounded to 8 decimal places).
It is not a perfect square, so the root is irrational. In simplest radical form, √40 = 2√10, because 40 = 4 × 10.
40 lies between the perfect squares 36 (6²) and 49 (7²), so √40 is between 6 and 7. Our answer 6.32455532 fits that range.
You can check it by squaring the result: 6.32455532² ≈ 40.
| √40 | = 6.32455532 |
| 6.32455532² | = 40 |
| ∛40 | = 3.419952 |
| Number | Square root | Note |
|---|---|---|
| 27 | 5.196152 | |
| 28 | 5.291503 | |
| 29 | 5.385165 | |
| 30 | 5.477226 | |
| 36 | 6 | perfect square |
| 40 | 6.324555 | this page |
| 49 | 7 | perfect square |
| 50 | 7.071068 |
The square root of 40 is 6.32455532 (rounded to 8 decimal places).
No. The nearest perfect squares are 36 and 49.
Irrational. Its decimal never ends or repeats.
The cube root of 40 is about 3.419952.
Yes. Use the calculator on this page, or open the full free Scientific Calculator with memory, history and keyboard support.